Suction actuated fuel pump

Claim 1

A FUEL PUMP COMPRISING: (A) A BODY HAVING A WALL SURFACE AND A CAVITY OPENING TO SAID SURFACE; (B) A FLEXIBLE PUMPING DIAPHRAGM LARGER THAN THE MOUTH OF THE CAVITY OVERLYING SAID WALL SURFACE AND HAVING ITS MEDIAL PORTION EXTENDING ACROSS THE MOUTH OF THE CAVITY TO CLOSE THE SAME WHEN THE DIAPHRAGM IS IN SEALING ENGAGEMENT WITH THE EDGE OF THE CAVITY; (C) MEANS SEALING THE PERIPHERAL PORTION OF THE PUMPING DIAPHRAGM TO SAID BODY SO THAT THE PUMPING DIAPHRAGM AND THE BODY TOGETHER FORM A PUMPING CHAMBER OF EITHER SMALL OR LARGE MAXIMUM VOLUME DEPENDING UPON WHETHER SAID DIAPHRAGM IS IN SEALING ENGAGEMENT WITH THE EDGE OF THE CAVITY OR SPACED THEREFROM; (D) MEANS FORMING VALVED INLET AND OUTLET PASSAGES LEADING INTO AND FROM SAID CAVITY; (E) MEANS YIELDINGLY BIASING THE PUMPING DIAPHRAGM TOWARD SAID BODY AND HOLDING THE SAME IN SEALING ENGAGEMENT WITH THE EDGE OF THE CAVITY SO THAT THE MAXIMUM VOLUME OF THE PUMPING CHAMBER IS NORMALLY SMALL, AND ONLY SAID MEDIAL PORTION OF THE PUMPING DIAPHRAGM IS OPERATIVE TO EFFECT PUMPING; (F) A PULSATION MOTOR OPERABLE UPON BEING ENERGIZED BY FLUID PRESSURE PULSATIONS TO EFFECT RECIPROCATING MOTION OF A MAGNITUDE PROPORTIONAL TO THE MAGNITUDE OF THE ENERGIZING PRESSURE PULSATIONS; AND (G) MEANS DRIVINGLY CONNECTING SAID MOTOR WITH THE MEDIAL PORTION OF THE PUMPING DIAPHRAGM TO FLEX IT BACK AND FORTH WITHOUT DISTURBING THE SEALING ENGAGEMENT BETWEEN SAID DIAPHRAGM AND THE EDGE OF THE CAVITY AS LONG AS THE MAGNITUDE OF THE FLUID PRESSURE PULSATIONS BY WHICH THE MOTOR IS ENERGIZED IS LESS THAN A PREDETERMINED VALUE, BUT TO WITHDRAW SAID PUMPING DIAPHRAGM FROM ITS SEALING ENGAGEMENT WITH THE EDGE OF THE CAVITY AND THUS INCREASE THE MAXIMUM VOLUME OF THE PUMPING CHAMBER AND THE DISPLACEMENT OF THE PUMP WHEN THE MAGNITUDE OF THE FLUID PRESSURE PULSATIONS ENERGIZING THE MOTOR IS IN EXCESS OF SAID PREDETERMINED VALUE.